Comment on "A new hydrous silicate, a water reservoir, in the
upper part of the lower mantle" - Reply

Ohtani E, Mizobata H, Kudoh Y, Nagase T, Arashi H, Yurimoto H, Miyagi I
GEOPHYSICAL RESEARCH LETTERS 

25: (7) 981-982 APR 1 1998


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Abstract:

Phase G reported by Ohtani et al. [1997] and Kudoh et al. [1997a] is
identical with the new phase D reported by Kuroda and Irifune [1998]
and Yang et al. [1997]. However, there is ambiguity on existence of
phase D defined by Liu [1987]. There are following possibilities on
existence of Liu's phase D; (1) the product was a mixture of phase G
and the other contaminant phases, (2) it realy exists stably in
different pressure and temperature conditions from those studied by
our works, or (3) the phase is a metastable phase formed due to a
short run duration and/or no sealing of water in the diamond anvil
cell. Therefore, it is not appropriate to use the name phase D for the
dense hydrous magnesium silicate phase G reported by us [Ohtani et
al., 1997].